The National Geographic has released Before the Flood, a documentary by Oscar Award-winning actor Leonardo DiCaprio for free on You Tube and other venues. See it now — it will only be online free until November 6.

DiCaprio has been fascinated by extinction since childhood when he spent time at the Los Angeles Natural History Museum. He took three years to make this 1 hour 35-minute documentary on the threats to life on earth for animals and people everywhere from climate change.